import java.util.*;

public class Messages2 {
public static void main(String[] args) {
Map<String,String>messages = new TreeMap<>();
messages.put("Justin","Hello!Justin的信息!");
messages.put("Monica","给Monica的悄悄话!");
messages.put("Irene","Irene的可爱猫喵喵叫!");
System.out.println(messages);
}
}

